Some problems still exist with security. According to Harteveldt, airlines like United Airlines, which allows passengers to use any card with their names on it to search for a reservation, can pose a problem where more than one passenger has the same name. In this case a passenger can easily gain access to another traveller's personal information, and even worse, their boarding pass. Security risks were not the only concerns late 2001. Network reliability is also paramount to the proper running of such as solution.